Causes of Multiple sclerosis

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No single cause has been identified and many factors are probably involved

MS is not hereditary but can occur in more than one family member, suggesting a genetic predisposition. You are more likely to get MS if other people in your family have it, especially a brother or sister.
An environmental agent such as a virus may be involved although no single virus has been identified as being responsible.
Environmental factors may trigger MS in susceptible people, amongst the environmental factors suggested are diet, stress, trauma and nutrition.
MS is more common in people of certain tissue types (HLA groups);
Evidence suggests MS may result from an auto-immune process (where the body attacks its own cells or tissues)
The incidence of MS increases in countries further from the equator. It is 5 times more common in temperate zones than in the tropics.